Valve.



' NTTBD PATENT @FFTQE JACOB B. BEAM, OF PUNXSUTAWNEY, PENNSYLVANIA.

VALVE.

Application led March 19, 1913, Serial No. 755,370. Renewed October 3,1916.

l/ b @ZZ 'whom 'it /mcji/ concern Be it known that l, Jaron B. BEAM, acitizen of the United States, residing in l?unxsutawney, in the countyof Jefferson and State of Pennsylvania, have invented certain new anduseful Improvements in Valves, of which the follmving is a speciiicmtion.

My invention relates particularly to blowoil valves for steam boilersand the object of my invention is to provide a valve of this class ofimproved construction which may be taken apart and put together forpurposes of repair while the boiler' is under pressure and which isprovided with one or more removable valve-seats which are so formed andso mounteL that they make a steam tight connection with the two membersof the .'alve-casing and the necessity of using packing between saidsections is avoided.

@ther features of the invention will be hereinafter described.

' walls of the seat D and The accompanying drawing shows a verticalcentral section of a blow-ofl valve for steam boilers embodying myimprovements.

The valve casing is formed in two sections A and B. The lower section Ahas threaded entrance port a to connect with a supply pipe and athreaded exit port a to connect with a suitable discharge pipe. The

section A is provided with a chamber o2 between which and the entranceport e is interposed a stel valve C. The casing 'B is provided with achamber L which communicates with the chambers a2, c3 through thevalveseats D and E. These seats are preferably precisely of the samesize and the same shape, their outer surfaces being tapered in oppositedirections. Both of them are provided with faces d, c adapted to engagethe val ve F when in line therewith. The seat lil however when in theposition sho.vn in Fig. l of course does not engage the valve. rit thistime it operates merely as a gasket. The walls of the section i aretapered at a* to lit closely the tapered walls 0f the seat E and thewalls of the section B are tapered properly at Z1 to lit closely thetapered walls of the seat E. Tn like manner the walls of the section Aare tapered at d to fit the tapered in the section B l place a taperedring G which lits closely a tapered portion of section B and also fitsclosely the tapered walls of the seat D. The sections A and B arevhanged as shown and are secured together with threaded pins orSpecification of Letters Patent.

)Patented May 8, i917.

serial No. 123,518.

bolts H and nuts 7i. No packing is used between the sections but whenthe bolts and nuts are tightened the two sections are drawn toward eachother and clamp the seats D and E between them so closely as to formsteam-tight joints.

lt will be observed that the tapered portions of the seats are straighttapers in contradistinction to being rounded so that the seats are notliable to rock in their mountings as might be the case if anobstruction, such as scale, should lodge on the edge of one of the seatsor on the valve face.

lt will furthermore be observed that the ring (l is differentiallytapered, that is to say, the inner tapered side which lits the outerwall of the valve-seat D is not inclined to so great an extent as theouter wall of the ring. The function of this construction will behereinafter more fully described.

The section B is provided with a chamber for the valve F. This chambermay be enlarged at t' so as not to touch the valve while the portion z"of the chamber may be made to lit the valve closely` This portion ismachined in order to make a smooth connection but the portion z' may beroughly cast. The valve is provided with a guide pin f operating in agroove f of the casing section B. This permits the valve to move backand forth toward the valveseat7 but prevents it from turning. The valveF is formed with a boss f2 over which is fitted a soft metal frustumshaped ring J which is held in place by another frustum shaped ring Jitting over the boss f2.

lil is a shield which serves to prevent scale striking the soft metalcasing of the valve. The rings J, J and the shield K are held in placeby the Cotter pin L. By removing this pin the shield and two rings maybe easily taken olf and replaced.

No claim is made herein to the devices for attaching the friistum shapedring J to the valve, the right being reserved to claim suchsubjectmatter in another application.

The valve spindle M is provided with a hand-wheel M and is formed with athreaded portion m which engages the valve F and operates it in theusual way. The spindle is formed with an annular flange fm arranged in arecess in the upper part of the casing section B. around the valvespindle is placed packing material N and between this packing and Inthis recess the flange mi is arranged a washer n. A gland O is attachedby bolts 0 to the section B and bears on the flange m. lVhen the boltsare tightened pressure is communicated through the liange m and thewasher n to the packing N. It will be observed that the gland does notcome in direct contact with the packing and that when the spindle isturned there is no wear produced directly on the packing. No claimhowever i v made herein to the subject-matter `iust described, the rightbeing reserved to claim such subject-matter in another application.

lWhen the parts are assembled in the manner shown in lF ig. l and thestop valve C is open steam will pass through the valve C and through thevalve-seats D and E to the discharge port c. By operating the hand-wheelM the passage of steam through the valve-seat D may be arrested. IVhenthe active face of the valve-seat D becomes worn the casing sections maybe separated and the seat D reversed presenting a new face to coperatewith the valve F. INhen both faces of the seat D are worn out the seat Dmay be entirely removed and replaced by the seat E and the seat D maythen take the place of the seat E and will act as a gasket.

It may be readily understood how this may be done because it is onlynecessary to loosen the bolts and separate the sections A and B when theseats D and E may be removed, reversed, interchanged or replaced. INhensuch separation takes place the stop valve C may be employed to shut offthe passage of steam to the chamber a2 until after the valve seats arereadjusted.

It will be observed that the construction is such that the valve F maybe withdrawn through'the opening below it in the casing section B whensaid section is separated from the section A. In order to do this thesection B is lifted from'the section A and then the valve-seat D withthe ring G adhering thereto is withdrawn from the opening in the uppersection. This, as is clear from the drawings, leaves an openingsufliciently large to permit the valve to pass' out from its casingsection. In order that the ring G may readily separate from the casingsection B its outer wall is given a decided taper. If said outer wallwere straight or ,only slightly tapered separation would be made moreditlicult.

`While I have shown my improvements applied to a specific form of valvein which the entrance and exit ports are in line with each other, 'andin which a spare valve-seat is used, I do not wish to limit myself to avalve of this construction as my improved valve-seat and its devices forattaching it to a valve casing are applicable'to valves of variouskinds.

I claim as my invention:

1. A blow-ofiy valve, comprising a sectional valve casing havingcommunicating openings with tapered walls, a reversible valve-seathaving tapered outer walls engaging thc tapered wall of the lower casingsection, a ring surrounding and closely fitting the upper portion of thevalve-seat detachable therefrom and having tapered outer walls engagingthe tapered walls of the opening in the upper casing section.

2. A blow-off valve, comprising a casing having two sectionscommunicating with each other, the lower section having an openingformed with tapered walls to re' ceive a valve-seat and the uppersection having an opening of larger diameter and having tapered walls,a` vvalve removable through said last mentioned opening, a reversiblevalve-seat having tapered walls en-` gaging the tapered walls of theopening in the lower casing section, and a ring surrounding the upperportion of the valveseat closely fitting it detachable therefrom andhaving tapered outer walls engaging the tapered walls of theopening inthe upper section of the casing.

In testimony whereof, I have hereunto subscribed my name.

JACOB B. BEAM.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Fatemi;

Washington, D. C.

